Add mouse input forwarding to gpu service

content/common/gpu/gpu_channel_manager.h

Index: content/common/gpu/gpu_channel_manager.h
diff --git a/content/common/gpu/gpu_channel_manager.h b/content/common/gpu/gpu_channel_manager.h
index 4759f806d1a701e24ccf6efdb2e99dc40d25c3c6..6fe2707abf9a9be62849c411f08bbffde1c27602 100644
--- a/content/common/gpu/gpu_channel_manager.h
+++ b/content/common/gpu/gpu_channel_manager.h
@@ -15,6 +15,7 @@
 #include "base/memory/weak_ptr.h"
 #include "base/message_loop/message_loop_proxy.h"
 #include "build/build_config.h"
+#include "content/common/content_param_traits.h"
 #include "content/common/gpu/devtools_gpu_instrumentation.h"
 #include "content/common/gpu/gpu_memory_manager.h"
 #include "ipc/ipc_listener.h"
@@ -125,6 +126,8 @@ class GpuChannelManager : public IPC::Listener,
   void DestroyGpuMemoryBufferOnIO(const gfx::GpuMemoryBufferHandle& handle);
   void OnDestroyGpuMemoryBuffer(const gfx::GpuMemoryBufferHandle& handle,
                                 int32 sync_point);
+  void OnHandleInputEvent(const blink::WebInputEvent* input_event,
+                          bool is_keyboard_shortcut);
 
   void OnLoseAllContexts();